fix: crash issue when dependencies are requested out of python range (#…

…2176)
pdm-project · Aug 9, 2023 · c2af2b2 · c2af2b2
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diff --git a/news/2175.bugfix.md b/news/2175.bugfix.md
@@ -0,0 +1 @@
+Fix a bug that dependencies requested out of the range of `requires-python` cause PDM to crash.
diff --git a/src/pdm/resolver/providers.py b/src/pdm/resolver/providers.py
@@ -206,7 +206,11 @@ def get_dependencies(self, candidate: Candidate) -> list[Requirement]:
         # requires-python=">=2.7". But it is eligible if A has environment marker
         # A1; python_version>='3.8'
         new_requires_python = candidate.req.requires_python & self.repository.environment.python_requires
-        if candidate.identify() not in self.overrides and not requires_python.is_superset(new_requires_python):
+        if not (
+            candidate.identify() in self.overrides
+            or new_requires_python.is_impossible
+            or requires_python.is_superset(new_requires_python)
+        ):
             valid_deps.append(PythonRequirement.from_pyspec_set(requires_python))
         return valid_deps